The state, condition, or fact of being a cousin; kinship, consanguinity.

In extended and figurative use: affinity, similarity, relatedness. Compare "cousin". rare after 16th century.

A body of cousins or relatives; an extended family group.

A right to land based on one's status as next of kin. Chiefly in "writ of cosinage" (occasionally also "writ of cousinage"): an action by a party based on the seisin of a person to whom that party is next of kin, for the recovery of land of which that party had been dispossessed. Compare "cousin".